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Method and device for controlling energy balance between bridge arms of modularized multi-level converter

A modular multi-level, energy-balanced technology, applied in output power conversion devices, conversion of AC power input to DC power output, electrical components, etc. Arm energy imbalance and other problems, to achieve the effect of improved stability and reliability, flexible application

Inactive Publication Date: 2014-02-19
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the energy imbalance between the bridge arms of the modular multilevel converter causes the unstable operation of the modular multilevel converter, the present invention proposes a modular multilevel converter Energy balance control method and device between bridge arms

Method used

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  • Method and device for controlling energy balance between bridge arms of modularized multi-level converter
  • Method and device for controlling energy balance between bridge arms of modularized multi-level converter
  • Method and device for controlling energy balance between bridge arms of modularized multi-level converter

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specific Embodiment approach 1

[0038] Specific implementation mode 1. Combination figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 and Figure 8 Describe this specific implementation mode, a method for controlling energy balance between bridge arms of a modular multilevel converter described in this specific implementation mode, the modular multilevel converter has a three-phase circuit structure, and each Each phase circuit includes an upper bridge arm and a lower bridge arm. The upper bridge arm includes N submodules with the same structure, and the lower bridge arm includes N submodules with the same structure. Each submodule has a capacitor, which It is characterized in that the control method includes the following steps:

[0039] Step 1: Detect the capacitor voltages in each sub-module in the single-phase bridge arm, and calculate the sum U of the capacitor voltages of the N sub-modules in the upper bridge arm in the single-phase bridge arm respectively sum_up and the sum of capacitor vol...

specific Embodiment approach 2

[0048] Embodiment 2. The difference between this embodiment and the energy balance control method between bridge arms of a modular multilevel converter described in Embodiment 1 is that the difference obtained in step 2 is Perform PI adjustment to obtain the given value of the DC component in the single-phase bridge arm circulating current The process is: i c , 0 * = ( K p 1 + K i 1 s ) ( U dc - U sum ) ,

[0049] K p1 is the first proportional coefficient adjusted by PI, K i1 It is the firs...

specific Embodiment approach 3

[0050] Embodiment 3. The difference between this embodiment and the energy balance control method between bridge arms of a modular multilevel converter described in Embodiment 1 is that the difference to be obtained in step 3 After PI adjustment, it is multiplied with a unit sine signal to obtain the given value of the AC component in the single-phase bridge arm circulating current The process is: i c , 1 * = [ ( K p 2 + K i 2 s ) ( U sum _ up - U sum ...

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Abstract

The invention provides a method and device for controlling the energy balance between bridge arms of a modularized multi-level converter and relates to the field of control over the energy balance between the bridge arms of modularized multi-level converters. The method and device for controlling the energy balance between the bridge arms of the modularized multi-level converter solve the problem that energy imbalance between the bridge arms of the modularized multi-level converter causes unstable operation of the modularized multi-level converter. According to the method for controlling the energy balance between the bridge arms of the modularized multi-level converter, an alternating-current component is added to a bridge arm circulation, so that a channel of energy exchange between the upper bridge arm and the lower bridge arm is formed, and on the premise that the alternating-current output voltage of the modularized multi-level converter is not influenced, energy balance of the upper bridge arm and the lower bridge arm is controlled through the control over the component of the alternating-current circulation. According to the device for controlling the energy balance between the bridge arms of the modularized multi-level converter, an inner-ring controller composed of a standard proportional resonance adjuster is adopted, and both the stability and the reliability of the modularized multi-level converter are improved by over 5% through the control over the energy imbalance of the upper bridge arm and the lower bridge arm. The method and device are suitable for controlling the energy balance between the bridge arms of the modularized multi-level converter.

Description

technical field [0001] The invention relates to the field of energy balance control between bridge arms of modularized multilevel converters. Background technique [0002] Modular multilevel converter (MMC), as a new type of high-voltage and high-power electric energy conversion technology, has increasingly attracted the attention of researchers from various countries. Compared with traditional two-level and three-level converters, MMC has many advantages such as simple structure, easy expansion, low switching loss, less voltage harmonics, and low installation and maintenance costs. [0003] In the three-phase MMC circuit structure, each phase circuit contains two upper and lower bridge arms. Each bridge arm is composed of N sub-modules with the same structure and an inductor in series. Each sub-module is a half-bridge topology, including Two insulated gate bipolar transistors (Insulated gate bipolar transistor, IGBT) and a set of capacitors. However, when MMC is actually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M1/32
Inventor 徐殿国李彬彬徐聃聃杨荣峰
Owner HARBIN INST OF TECH
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